Rooting for NSK bearings

The food industry demands many prerequisites of its bearings, not least long service life, high-speed capability, hygienic operation and robust sealing technology. Without these attributes, food plants will incur higher maintenance costs and unscheduled production downtime, both of which impact upon bottom-line profitability. To overcome these issues, increasing numbers of vegetable processing facilities are identifying NSK’s Life-Lube series as the optimum bearing choice for demanding applications, such as washing systems.

Life-Lube bearing units comprise two key components, the first of which is a thermoplastic polyester (PBT) housing that provides corrosion resistance and eliminates any risk of contamination from painted or coated surfaces.

The housing also features nitrile rubber seals to prevent the ingress of contamination and water/cleaning chemicals from repeated washdown procedures. “In comparison with standard bearings, users of Life-Lube units can reduce or even eliminate the annual costs associated with maintenance and downtime,” says NSK.

Lifetime of lubricating oil and polyolefin resin

The stainless-steel insert of the Life-Lube series features NSK’s proprietary Molded-Oil cavity, which contains a lifetime of lubricating oil and polyolefin resin, so that no re-lubrication is required – again reducing maintenance costs.

Among a growing number of food plants enjoying the benefits of Life-Lube bearing units is a premium vegetable processing company. The facility was previously experiencing frequent bearing failures on a high-volume carrot washing line, causing significant downtime and reduced production. The company would often have to change its bearings every six weeks.

NSK performed a bearing failure analysis and application review as part of its AIP Added Value Programme. In particular, NSK conducted a process mapping exercise of the carrot washing operation, identifying problematic areas for the bearings. The analysis revealed that the ingress of hard-particle contamination and washdown fluids were significantly reducing bearing life. In effect, the lubricant of the standard bearings was washing out, leading to premature failures.

Vastly improved bearing life

“The expert team of NSK specialists recommended Life-Lube bearing units featuring Molded-Oil inserts, with a subsequent trial demonstrating vastly improved bearing life,” says the company. No failures had occurred after a year of operation. “The vegetable processing company is now enjoying significant annual cost savings, with reduced downtime and maintenance, as well as increased productivity.”

Described as ideal for any operations where contact with process fluids is unavoidable, NSK Life-Lube bearing units are available in bore sizes from 20-40 mm. To ensure design flexibility, housings come in various types, including two-bolt, four-bolt, pillow block and take-up units.